US20060124210A1 - Annealing process of a stainless steel band - Google Patents

Annealing process of a stainless steel band Download PDF

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Publication number
US20060124210A1
US20060124210A1 US11/290,269 US29026905A US2006124210A1 US 20060124210 A1 US20060124210 A1 US 20060124210A1 US 29026905 A US29026905 A US 29026905A US 2006124210 A1 US2006124210 A1 US 2006124210A1
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US
United States
Prior art keywords
stainless steel
steel band
annealing
roughness
annealing process
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/290,269
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English (en)
Inventor
Alain Marchal
Francis Bourdon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DMS SA
Original Assignee
DMS SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DMS SA filed Critical DMS SA
Assigned to DMS, SOCIETE ANONYME reassignment DMS, SOCIETE ANONYME ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BOURDON, FRANCIS, MARCHAL, ALAIN
Publication of US20060124210A1 publication Critical patent/US20060124210A1/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing
    • C21D8/0421—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing characterised by the working steps
    • C21D8/0436—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing
    • C21D8/0447—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing characterised by the heat treatment
    • C21D8/0473—Final recrystallisation annealing

Definitions

  • This invention relates to an annealing process of a stainless steel band.
  • a sheet metal band runs on a determined pathway and is rolled between two cylinders for reducing the thickness thereof.
  • annealing methods consist in bringing the material back to a stable state, whereby the material is then softened and the ductility thereof is restored.
  • annealing types may be singled out, i.e. so-called intermediate annealing and so-called final annealing.
  • the stainless steel metal band To obtain the requested sheet metal thickness, it is often necessary to subject the stainless steel metal band to several successive cold rolling steps. In such a case, the stainless steel band circulates along a closed loop to pass several times between the rolling cylinders.
  • the metal band should be softened to conduct a new sequence: it is intermediate annealing.
  • the sheet metal or stainless metal band After exposure to a last cold rolling step, the sheet metal or stainless metal band should be softened and exhibit faultless finish to be sellable: it is final annealing.
  • finish quality to be obtained after the intermediate annealing process is not necessarily the same as the final annealing.
  • a suitable method is thus known: annealing and etching by chemical agent.
  • Final annealing may be either glossy annealing, i.e. said annealing-etching.
  • Glossy annealing is conducted in a closed chamber furnace and under non-oxidizing controlled atmosphere which is composed of a mixture H 2 /N 2 with a maximum proportion of N 2 at 25%, possibly even pure H 2 .
  • Glossy annealing may also be realized by means of a transversal magnetic flux induction heating method, which enables to increase directly the temperature of the band.
  • the furnace is followed by at least a pair of cylinders whereof the enveloping wall is polished like a mirror, so-called “pass skin”, capable of imparting superficial rolling to the band.
  • Such glossy annealing process provides good results and enables to obtain sheet metals whereof the finish is of quality, defined BA according to the International metal qualification.
  • Annealing is then conducted in an open chamber furnace.
  • the oxygen content is controlled between 3 and 6% according to the steel grade. Because of the oxidizing atmosphere, a chemical etching treatment is necessary for removing the oxide layer, still called scale.
  • This chemical treatment implies the implementation of different chemicals in relation to the grade of the steel treated, generating effluents which may be in gaseous or liquid state.
  • the finish quality is so-called 2D according to the International metal qualification.
  • the sheet metal band may then pass between two polished mirror cylinders for obtained small roughness while subjecting it to very small elongation.
  • the finish quality is so-called 2B.
  • the chemicals necessary to the etching, as well as the energy for using them, notably for heating chemical baths and electrolysis, as well as the dispositions to be taken for de-pollution represent significant running costs.
  • the known annealing and etching process by chemical agents has a production capacity ranging generally between 180,000 tons per annum and 230,000 tons per annum.
  • Glossy annealing with traditional furnace, for its own part, has smaller production capacity ranging between 60,000 tons per annum and 100,000 tons per annum.
  • the purpose of this invention is to provide a method and an annealing device which remedy the aforementioned shortcomings, and notably breaking free from using chemical agents.
  • Another purpose of the invention is to provide a final annealing process of stainless steel bands, equivalent to qualities 2D and 2B, authorizing later on the stamping operations.
  • the invention relates first of all to an annealing process of a stainless steel band, after exposure to at least one first rolling step, wherein at least the following steps are conducted, notably successively:
  • the invention also relates to an annealing device for implementing the method comprising:
  • FIG. 1 is a schematic view of an illustration of a cold rolling method comprising notably an annealing and etching step by chemical agent of the previous art.
  • FIG. 2 is a schematic view of an illustration of a cold rolling method comprising a final glossy annealing process of the previous art.
  • FIG. 3 is a schematic view of an illustration of a cold rolling method comprising an annealing process according to the invention.
  • FIG. 1 illustrates a cold rolling method 1 , comprising an annealing process of the previous art, and comprises a first annealing and chemical agent etching step 20 .
  • the quality of the stainless steel band upon completion of this step is called 2D according to the International metal qualification.
  • the stainless steel band is then subjected to a superficial rolling step by means in particular of polished mirror cylinders 21 .
  • the quality of the stainless steel band at the outlet of this step is called 2B according to the International metal qualification.
  • the annealing process 20 formed of the annealing and etching step, may constitute an intermediate annealing process. Indeed, the metal band may follow a closed loop and undergo several passages through the rolling cylinders until the requested thickness of the band is obtained.
  • FIG. 2 illustrates schematically a cold rolling method comprising final annealing step, of known glossy annealing type of the previous art. It should be noted that in the glossy annealing, no chemical treatment is necessary. Advantageously, the dew point in each glossy annealing furnace should be as low as possible.
  • Transversal magnetic flux induction heating furnaces are also known.
  • the main advantages of induction heating lies in their high electric throughput, and high surface power enabling to reach, as quickly as possible, the right temperature in said band.
  • the principle of glossy annealing is suited to a method enabling to provide a product equivalent to that obtained in the annealing etching by chemical agent.
  • the invention relates therefore to an annealing process 4 of a stainless steel band, after prior exposure to a first rolling step wherein at least the following steps are performed, regardless of the order:
  • the stainless steel band is cooled efficiently after being heated.
  • the reducing atmosphere may in particular be formed of a mixture H 2 /N 2 containing a maximum proportion of N 2 of 25% or, possibly, pure H 2 .
  • the implantation of the heating sections of the band will be vertical.
  • said steel band is cooled by circulating a reducing gas.
  • the method will enable to reach significant production capacities above 200,000 tons/year.
  • heating and rapid cooling will be implemented, with heating powers of the order of the Mega W/m2 and cooling speeds of the order of 100° C./s.
  • a roughness by superficial rolling is printed causing very small elongation of the stainless steel band.
  • sufficient roughness is printed by superficial rolling for easier stamping of the stainless steel band.
  • a roughness equivalent to the roughness of a stainless steel of quality 2D defined by the International metal qualification is printed.
  • This quality of stainless steel may in particular be obtained, with the annealing methods of the previous art by an annealing and etching process.
  • a roughness equivalent to the roughness of a stainless steel of quality 2B defined by the International metal qualification is printed.
  • This steel quality may in particular be obtained, with the annealing methods of the previous art by an annealing-etching step to which a superficial rolling step is added by means of polished mirror cylinders.
  • the invention also relates to an annealing device for implementing the method, the device comprising:
  • the means for printing on the surface a roughness onto said stainless steel band are formed by a rolling device comprising at least one pair of cylinders with a rough surface.
  • the heating means are formed by a vertical furnace 2 exhibiting induction heating means.
  • the vertical furnace 2 comprises the following elements in all or in part:
  • the induction heating means may be constituted advantageously of two reels parallel to said steel band and capable of generating a magnetic field transversal to said band. They enable to bring the stainless steel band to a temperature to 1,200° C.
  • the cooling means enable to accelerate the temperature drop of said band.
  • These cooling means may in particular take on the form of gas circulation means.
  • the circulating cooling gas is non-oxidizing.
  • the cooling means enable a temperature loss at a speed equal to or greater than 100° C./s.
  • the device may exhibit moreover means for measuring the roughness of the stainless steel band and/or actuating means capable of controlling the pressure of the cylinders with a rough surface.
  • a rolling plant comprises cold rolling cylinders 1 and an annealing device according to the invention, composed of a transversal induction vertical furnace 2 and of a superficial rolling device comprising at least one pair of cylinders 23 with a rough surface.
  • the annealing device is situated downstream of said rolling cylinders 1 .
  • the stainless steel band may also travel through a closed loop 22 ′ enabling several passage sequences of said band between the rolling cylinders 1 .
  • the quality of said stainless steel bond is called 2B + (of a quality equivalent to the quality 2B obtained traditionally with an annealing etching process).
  • the annealing process will find a particular application in a rolling process such as an intermediate annealing process intended for softening the material and restoring the ductility of said stainless steel band.
  • the annealing process will find another application in a rolling process such as a final annealing process. It will be in particular used such as a final annealing process for stainless steel bands intended to be stamped.
  • the stainless steels regarded by this annealing process will be in particular of two types, i.e. AISI 300 or AISI 400.
  • the main difference between a stainless steel AISI 300 of quality 2B obtained by tho traditional annealing and etching process and the stainless steel AISI 300 of quality 2B + will be its milky white appearance in the case of the 2B which will be non-polished grey in the case of the 2B + .
  • the annealing process according to the invention enables to have significant temperature rising speed and high energetic throughput.
  • the method according to the invention enables to avoid polluting chemical agents. Therefore, this annealing process may be advantageous from an ecological viewpoint.
  • a given rolling plant may be modular and might be fitted, according to the use with rough cylinders or with polished mirror cylinders.
  • the cylinders will be dismountable to be changed according to the use.
  • the plant is fitted with a superficial rolling device comprising at least a pair of cylinders 23 with a rough surface which enables at output 23 ′ to obtain a stainless steel band of quality 2B + .
  • the cylinders with a rough surface 23 may be replaced with polished mirror cylinders 21 .
  • the steel band may not undergo any superficial rolling and in particular the cylinders with a rough surface 23 or still the polished mirror cylinders 21 may be simply open.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Articles (AREA)
US11/290,269 2004-12-13 2005-11-30 Annealing process of a stainless steel band Abandoned US20060124210A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR04/13221 2004-12-13
FR0413221A FR2879216B1 (fr) 2004-12-13 2004-12-13 Procede de recuit d'une bande d'acier inoxydable

Publications (1)

Publication Number Publication Date
US20060124210A1 true US20060124210A1 (en) 2006-06-15

Family

ID=34952041

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/290,269 Abandoned US20060124210A1 (en) 2004-12-13 2005-11-30 Annealing process of a stainless steel band

Country Status (9)

Country Link
US (1) US20060124210A1 (de)
EP (1) EP1669465B1 (de)
JP (1) JP2006176877A (de)
CN (1) CN100513591C (de)
AT (1) ATE429520T1 (de)
BR (1) BRPI0505369A (de)
DE (1) DE602005014069D1 (de)
ES (1) ES2326378T3 (de)
FR (1) FR2879216B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102140574A (zh) * 2011-05-11 2011-08-03 北京冶金正源科技有限公司 一种提高430铁素体不锈钢深冲性能的退火工艺

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008010062A1 (de) * 2007-06-22 2008-12-24 Sms Demag Ag Verfahren zum Warmwalzen und zur Wärmebehandlung eines Bandes aus Stahl

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3556874A (en) * 1967-08-01 1971-01-19 Republic Steel Corp Metal articles with controlled finish
US6200023B1 (en) * 1999-03-15 2001-03-13 Steag Rtp Systems, Inc. Method for determining the temperature in a thermal processing chamber

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JPS60177137A (ja) * 1984-02-22 1985-09-11 Nisshin Steel Co Ltd ステンレス鋼帯の焼鈍酸洗設備
CA2097900C (en) * 1992-06-08 1997-09-16 Saiji Matsuoka High-strength cold-rolled steel sheet excelling in deep drawability and method of producing the same
JP3241495B2 (ja) * 1993-07-15 2001-12-25 川崎製鉄株式会社 光沢に優れたフェライト系ステンレス鋼板の製造方法
FR2753989B1 (fr) * 1996-10-02 1999-12-24 Steel Authority Of India Limit Procede perfectionne pour fabriquer de l'acier inoxydable ferritique a deux phases, presentant une aptitude elevee au formage et contenant 17 % de chrome
EP0923420A1 (de) * 1996-12-26 1999-06-23 J & L Specialty Steel, Inc. Bürstverfahren zur verbesserung des korrosions- und oxydationswiderstandes
FR2775205B1 (fr) * 1998-02-25 2000-03-24 Usinor Installation de fabrication de bandes d'acier inoxydable laminees a froid
KR100484037B1 (ko) * 1999-03-30 2005-04-18 제이에프이 스틸 가부시키가이샤 성형성이 우수한 페라이트계 스테인레스 강판
US6301943B1 (en) 1999-07-06 2001-10-16 J&L Specialty Steel, Inc. Method for finishing cold-rolled stainless steel
JP2001020045A (ja) * 1999-07-07 2001-01-23 Nippon Steel Corp ステンレス鋼板素材およびその製造方法
KR100762151B1 (ko) * 2001-10-31 2007-10-01 제이에프이 스틸 가부시키가이샤 딥드로잉성 및 내이차가공취성이 우수한 페라이트계스테인리스강판 및 그 제조방법
JP2004074214A (ja) * 2002-08-16 2004-03-11 Nikko Metal Manufacturing Co Ltd ラミネート材とのピーリング強度を向上した金属圧延箔
JP2006142343A (ja) * 2004-11-22 2006-06-08 Jfe Steel Kk 防眩性に優れたＭｏ添加フェライト系ステンレス鋼板の製造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3556874A (en) * 1967-08-01 1971-01-19 Republic Steel Corp Metal articles with controlled finish
US6200023B1 (en) * 1999-03-15 2001-03-13 Steag Rtp Systems, Inc. Method for determining the temperature in a thermal processing chamber

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102140574A (zh) * 2011-05-11 2011-08-03 北京冶金正源科技有限公司 一种提高430铁素体不锈钢深冲性能的退火工艺

Also Published As

Publication number Publication date
ES2326378T3 (es) 2009-10-08
ATE429520T1 (de) 2009-05-15
JP2006176877A (ja) 2006-07-06
EP1669465A2 (de) 2006-06-14
CN1800420A (zh) 2006-07-12
CN100513591C (zh) 2009-07-15
FR2879216B1 (fr) 2007-04-20
EP1669465B1 (de) 2009-04-22
BRPI0505369A (pt) 2006-09-12
DE602005014069D1 (de) 2009-06-04
EP1669465A3 (de) 2007-07-11
FR2879216A1 (fr) 2006-06-16

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Owner name: DMS, SOCIETE ANONYME, FRANCE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MARCHAL, ALAIN;BOURDON, FRANCIS;REEL/FRAME:017144/0499

Effective date: 20060126

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION